i a) the plaitpoint surface 
performed with horizontal 
influence of the pressure on the 
ternary system (On the phenomena which occur when 
meets the two sheet three-phase surface. 182. 
t e s c fr (p.). On jurassic fossils as rounded pebbles in North Brabant and Limburg. 422 
theory (The) of the ZEEMAN-effect in a direcliou inclined to the lines of force. 321 
— (A new) of the phenomenon allotropy. 763. 
thermomagnetic properties (The) of elements. 596. 
tidal constants (On the determination of) from obser 
pendulums. 2. 
TIMMERMANS (j.) and Ph. Kohnstamm. On 
miscibility of two liquids. 235. 
— (Some remarks suggested by a paper by). 454. 
tombrock (w.) and Ernst Cohen. The electromotive force of zinc amalgams. 98 . 
tonus (About the formation of creatine in the muscles at the) and the development 
of rigidity. 550. 
transformations (Continuous one-one) of surfaces in themselves. 2 nd Communication 286. 
traksvaal (Piennarite, a melanocratic foyaite from). 547. 
uric acid (The decomposition of) by bacteria. 54. 
urine (On the constitution of the) of sharks with normal and increased diuresis. 380. 
uven (M. j. v an). Investigation of the functions which can be built up by means 
of infinitesimal iteration. Contribution to the solution of the functional equation 
of Abel. 208. 427. 
— On the orbits of a function obtained by infinitesimal itei 
plane. 603. 
valkenburo (a T. van) Surface and structure of the cortex of a microcephalic 
idiot. 202.- 
variability in Bacillus prodigiosus. 640. 
vector distributions (On continuous) on surfaces. 2™* Communication. 7L6. 
velocities (The constructive determination of the) of a spacial system. 12. 
vibrations (The oscillations about a position of equilibrium where a simple linear 
relation exists between the frequencies of the principal). l*» part. 619. 2 n <* part. 735. 
violin (On the motion of the bridge of the). 513. 
VISC03ACCUABA8E, an enzym which produces slime from cane-sugar. 635. 
— (Emulsion laevulan, the product of the action of) on cane-sugar. 795. 
v o L l g r A f r (j. a.). Bemarks on the experiments of Wilson and Martijn on the 
velocity of rotation of the electric discharge in gases in a radial magnetic 
field. 428. 
vries (hk. de) presents a paper of Mr. J. Bruin : “On the surfaces the asymptotic 
lines of which can be determined by quadratures.*’ 759. 
v ribs (jan de). On pairs of points which are associated with respect to a plane 
cubic. 711. 
— On polar figures with respect to a plane cubic curve. 776. 
▼ BIBS (otto de). The abnormal reduction of an aromatic nitrocompound with 
tin and hydrochloric acid and an- interesting case of dismorphism. 305. 
